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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fd03058c01d8bcc43d4d2ce65220c20b7b22044169beaa57b107bcc2bb08c57' 
  AND token = '0gbNlMOcWLXWjwbJgn7ov685Xpw72nP3yIamBVB58Zo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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