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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3d8bec0b6c9b314c5acb13ae0303b9d04066f22515f773d53a07b99c5cbdb88' 
  AND token = 'RJolW3HRWhjK3cqE2DFFsJQ66rDfWXcQKARrIrkZN8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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