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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6b70e1e3e00ff62405fe819fd8bc7b55f189a60b4c3705d453438bf4373a3c0' 
  AND token = 'HIfFX9pGy7Hy3bnpZV5dGbfEdeoWUPn/zxcfmfVeLQw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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