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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7ad1c7926f87025276e836fd17c950f73bbd22697f48e545609205304bc36de' 
  AND token = 'TfK/xH9Mi7/5BDMAE6V2oCPtVbq30NwyOUxkb8r3toM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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