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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd0f22586fe32866db1c0592dc6bf0778034731ae8e3accc88e811e8fc4ecf2b' 
  AND token = 'Z28knYKjN94ezAAtdtAERR/XFAs212aBlcpvpka4I+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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