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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99e5d7b86de7e616cf73d0b07315430649baf1c4ae850bf051bbc9351bbbf7c8' 
  AND token = 'ES10H5FqvuIsUuu06gRbNR5vYTSQWbTuMbQi3aT5Z8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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