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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '694d2741af254003572f7f1f6afae9e27872b7fd1b983d39fda3025a469558b5' 
  AND token = 'KB0smi6b7H2/KIxNk7ihH2UhbmMljnaRm2kCpJ6M7yo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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