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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a91495b3f577cbea1044ea3027cea23885f6fa9b036e15022e99107effc2dfa5' 
  AND token = 'MSxBiOUBOi8T5QwiF+jYHm+sq1HDZV7L8EIL34IDJN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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