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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98566185e4e67e9b95ade4038d4b2c5b6dcc3abbd89ad850d96964c108532047' 
  AND token = 'XhuB7KRT23ekA5O6gd3BosBAcY4c2jTXUruK6mp2U2A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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