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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce97b3f3c375f511f7afce1c2c66304e81d33555f0ca14041afc2d3e5735bb39' 
  AND token = 'KCZMie/gT9bfPP2SQwZNZwCS6e8LCa7WxseWSS7tmwU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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