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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4899bd380f42ca442eea2a0189402530ca2aa92c8d6b1d612836b79d04d58d95' 
  AND token = '5ilMw6TdmhpzXHynfEZJa7Ybowpe8FPBBAOVzN8ILDo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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