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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0955cc90217dbb3c487ca99aff379777029481976b16b9e9609176861aefbfd' 
  AND token = '5HadTY097lxR/aMNKExIDU2EqJLR6QHJWowtgqdPz9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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