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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ced556c006c7b219eaa509db8d65918f9e35c4cb8162e0b8bcf7481ab46e6113' 
  AND token = 'dnZWHVDIlznE8qLdZUl03kCP9z79dBSNDfnCrgpdKmw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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