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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06f3fece0935ccf6654c742081618eb10b380e2a7e27f81a79811c8e238678a5' 
  AND token = 'sV2N/Et5wu1cOAemBXuJpyJb6xtMO30Kpq+ZgD9Ori4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00120

JSON explain

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