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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '388f1cf9e9c49bf888b2a042a8c6051bd836303625a1a939c533a4df8e3a97c4' 
  AND token = 'va2wjH5aawbBnxh0jvPhDRkr6PwElJ3aq49CMPSm2wg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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