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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bb2286dfd42b70d495d02ffb692434ef650613c70746d945a94f97d3070dfd0' 
  AND token = 'kCrogJQwHfUiCTIavUtHC7V+7gwRKYhNg2rtb+fHSpo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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