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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efc235ef0d2ce4ef245c2267853189082aa2823edff28c562489b42cd5841bb2' 
  AND token = 'A96EeuzcM30J6gUhc+Rfuamp2lPKFcXXBcO25E4kk2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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