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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce5b59d63ba2edcfc5e74ddfede7bc48141ed7f328c276bf7b391ce8e75d48c2' 
  AND token = 'OtQKJP/wUwwTNRPxhMcyz+eo0tgqwzP5+oqSuAZ6hNI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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