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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30bd8e3b1056783fb4a139c541c1282faa5d62d20ced417e7352e4ff7beadd55' 
  AND token = 'IyVYYmBusPHgHEXJPrm0jmSGNA1ahj7z4129ogPOHeA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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