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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42bc9bca316b96a7807478edcf01c32dad095ec3c0da408f2a6b2fab9465ba56' 
  AND token = 'sw9gDH/f0e+Ww+tZ1HSElkFAYy9Bw2SGGXN4pxkGdGk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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