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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27657b6e925843b7ac61bfc14cf528426fec9d123bfe0f16b75a8d1881f69ca3' 
  AND token = 's3EObTflpVAq64z80beAptT5kqEdr53M5PYcwfXh0IQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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