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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00538adf7695a20b55642b12bea1c8539fcec8e33a826416ee0fe0fb46dd7d15' 
  AND token = 'w5yjv/DhLPE2x/dsAnC29G4D90GvbS1sGOQG/djPK2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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