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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e86a65bce1f0bab58bc63d44ea6b730d2eca998a2fe6b29d16285ee7cd46d93' 
  AND token = 'BmohguLdmgW1pp5yOtlS2ec6EYGzSmTEGeUz0k5hg9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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