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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1dc233d8b91d3e1ef34bfe97be0d2a1bb653d17c31923767e72814a3558fa8dd' 
  AND token = 'RPuMsoq9MWKnpBQZ58X1QyI442/urPC71+0kkAxDf1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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