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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0dd4990945b27d2d856a7a94894daca41cd1df0e8f45ae698107cd50b6fa203' 
  AND token = '6Wny9FuOkb66k6L8yKyJ4xWeM96syNUweIrnF+4ygCQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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