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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b15507731088dba8bce202f358d34cde00b930b14a51b1171babb0368d7da10' 
  AND token = 'obBz7K0Wt3G3Ng6JqvjePyPoeUb1En0St/w5Yf0bSP4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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