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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96dd390259a16cf8bc190c54d2b663de6955ee594f3a88947cf3e9f85ecf2b70' 
  AND token = 'Nw7n1mdNX0YS67VvkPXb6hG4w50FaefMrx8oNTfP+Hs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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