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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6deb361dc313d6ee45b5bec5f96a2596dd97c399e219d68da16e433dd4c72e90' 
  AND token = 'v4kOa8pkmyvdbKStMQ9hHGV8tRbXcDBohPScRmCUA/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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