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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ea45f4e93da5b2d97ae47e9b7fbf13a5f41dd08ae381eefd3ef79fa6e52a752' 
  AND token = 'Pz4mVKvKvCSxtYhrNOY/p6xw+9uXcMQUEA9C7SEFAi4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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