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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3a61d87845803fff68af8eadf410abf3b59cc7201e5a7327a370104034c723a' 
  AND token = 'eGep56cm0FN4UUobhPPC415uI1/ign95Rqk3j51eNII=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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