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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55bd178b80b4a17c8cc105637ca3ff9ac6f1ecbfe0568a617fdeb13ae03946f4' 
  AND token = 'ig48KyE/GrK2DtWJeN/6yQ9+95+JGZceOfDYcHNzgzE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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