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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9be5413dbc9b742e7fab514bca85749efe7e3e7008420d8e8bb235beb0e5629c' 
  AND token = 'qvMYa2z3wB3ghcR7zzLOoZcuJYJgFuhMfIXmyXuAU0I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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