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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0cea39fbebeda5171b1c9d919afd761aec4039e20b7601282412bb0556ba1c9' 
  AND token = '6q/8WALxcnvnlrY3iVY6c98+49/zvsdj801GMCY8Kw4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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