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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe7f9b9a906079c2aecfe667a1f2e4e6151c64126752d2c115dfcdea4a82a8e3' 
  AND token = 'BOB51nUPQVgWv4UY92eEc7sOul6LPjw/7T4lzWZtYhM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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