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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad3662579e237f6b46e79915e98daa82c130d0b1b74219f29b13a0dd4ecaf7b8' 
  AND token = 'rX9sAYDvvXwRt7qfK+ximcD86hE4rllym3/VxHDUARc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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