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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f47862cd0fd87a16ea8cad830239f1af3904142a574172ea32c6899ebb298a3' 
  AND token = 'FM9AIkNp+2j5rnHwLmZG+/6HDlhkjRS/V+0mR7+Mfw4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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