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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7a602070c61cb2b089c91d6249bbef7e351b47aa479cc3596ffb950c5db047e' 
  AND token = 'smtuDV8tz/R+bOl1JIQlgCocLXB4Cy63/JlrPYLzH/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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