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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f7e9973a04995d942c1faeabce601d682d4e8d1b84b8fac3d0441ba1f612aca' 
  AND token = '5TU8YayuokSxjfCIIFwBXWQpQemzL2QSZBznaSuXHso=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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