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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '257a3587e56f2c0b5109903cfcef373cc998775970722f2b7d8ae2459c52c0a7' 
  AND token = 'jlmHQoTn701aC1JcyI+oCvfBNrmyvAKbwE4NjZiNcqs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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