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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7c4029dfea8703fc5fac38864991303788b22012f6124efb20bd72c8eb23f3b' 
  AND token = 'BOofybGeISmYKs5XCdwZHZTT6jZeyMWR0Kpb3+bNEZw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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