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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdc293919193cc8fd835f0ead78b4ca98ff51f0182d7c88d4a042fc4d83dfd65' 
  AND token = '0X7IxHE8vvg0iL++ypR/Ut3P51eoRiuOpauNI6neT00=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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