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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6f123ec1a0f4da4286e05d0ae5bf6b9a27b97e5590b05a2babfcca59db6173f' 
  AND token = '30yHUFQ7QxWuX0TehSRV47QvX4A5VCb7Qiq+kDDwfyk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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