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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6318d5e813c2637de39bfaaf71affcdd56e437dc53664134eae248352135393c' 
  AND token = 'M0Y4VjgqesRJOfJa+rae6D+E9zx3JF8AlGl8J2IX+cM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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