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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7f1b48b9928546823bacf199e3e4c6da2ad1c088fa73571b077d27dbe6498c6' 
  AND token = '3Dzq2cq82lRyNdPOvJofnMss7vDX2S5psEWjhzdX/Ks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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