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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '270559247581550d36d39c35dfeded8a6c5997d3ee6338fae2e9369aa17d4306' 
  AND token = 'mEGnth01IUOn1t6u2z6oJjw2D+662K3lazDg5wqX+Xo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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