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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac8af4ef5f1589355e1f6b7ea9c8cbaca396a0e00f38c9a11635fa867f0132b8' 
  AND token = 'DK0Z/ri3aYnJDEqD4rPpkcHRAcxkhRDmxQUXza8vaYU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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