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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60a24cad7247793b1c5d7b72611e86f55a8242237a852ea287db258755e9d6bb' 
  AND token = 'P47B8mqKP1RaN/+RiMu0NNT525aLbLFbaqnmuJ33N+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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