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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de77a58e147f18686228489711084b147dd20e61d24f65ed3ca241d9bca23da5' 
  AND token = 'lPfl18Y5unFG4N3ytFNPUlOxULFodHQAR2cjWghcJbo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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