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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7fc9260475de12473aa8e840f39f26a23f0adab65b1618954e9425faefc6647' 
  AND token = '1m9p6KtJE1+h8cKWt1gD1D49QIkLPWLlBrSuPftFK5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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