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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77fb4d2eeee40a4680236d9422d7a37cb93148aced2ec44a1d472989642ded95' 
  AND token = 'ZiQwn6vMfFV4gfBb1NB1Dqav2l1/skMCscOUAWIK11M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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