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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d64e5c8124896349308d0e6e9ea07a880996cd2b18ebf7a513d0c5dd95fae9a' 
  AND token = '+qqAvgjVg6LAoyQUbrV3N/iwinjttSkqS+gre+foWf4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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