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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba40cae62eaef02f851518d2d977b3f39798277a82ffa43865ea1dfaef68b620' 
  AND token = 'hkpEVqtd3x/TwZ8uSKnmXkJzPI6VVabaIMiodt5zQTk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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