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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '848b87aca8acb2303a4ae31a1a25f2e18fbea0f373acc35ef3002ee30b0b2c4d' 
  AND token = 'JdGMHBa9dz54VajP2jXbveqIXyHwYFUW4PKWZky6z5U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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