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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94e7bbcb15491af703de9a013632fb18210de3aa421a6375de0e3237732da84d' 
  AND token = 'woXVX46/GA5tWO4qJNQicW8B2eqSc5x+TY/7wjPV+IM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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