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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfa2de7a9388ec49b89578edec5fc4394fc5a9b727147c4fffcef76be8968c65' 
  AND token = 'EuxBmuosm0lbUccfrtbO0yUKsQA25s0a5pSqtnLkC1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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