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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b5aad7bbbdc174b7a3515fc21633c9b59a978cd2925b10b4146366a1d168efd' 
  AND token = '81MEnLWYd71f5Hb9XsZewGvwOVNDNxZF7H3Jf1O+LQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00106

JSON explain

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