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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95fe3b4a4a1dc36c3715f9f67679ad6c111f7d5d9f0db41ee7e57a71f9fd89e9' 
  AND token = '7XBOZaE1Jmo/d5bH78xWnEkoA/og2bwvLqOZGPNvJGE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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