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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d2eb8667fbde3209679f9763c8f0b2032edd867c26e94e240b3f503c75f21e7' 
  AND token = 'x66mOV3Ey6E0LeTLWPoN3BzsufXXxNiNnJOHOsQ95ik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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