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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0800d39667b082dd24cdb1991325bac52a35a368362a5b20bb74572b4677463' 
  AND token = 'C/F/3AO5uCd98CJloCr97F/Om6ZK4opTUtx/XvGVT1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}