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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ba9c0b31c5da815a38e72e51d651f14fd2cd3529a51541be661d6c877d56ba6' 
  AND token = 'oUyYM0eeKy9sgkpSdUhZRrpsKMmwII1VWRUpLYelaRA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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