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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9df58c979e70cc243f48864cef62d1894bc1edf8bc9530264cf750a0e9220d3a' 
  AND token = 'yTlRyN8S1C+dLxzTgwvFe28iBFacGJeL7O4yuuTliA4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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