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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9e9da0ce7f96c0332d58be23159ab3718eb03bf7ab351503d4b6784f29b67e2' 
  AND token = 'xTZHboXx/L5bS9PqZ8fihmVNImj2abjUYF6uGJOb5sM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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